<!DOCTYPE html>
<html>

<head>
  <meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
  <style>
    img{
      cursor: pointer;
    }
  </style>
</head>

<body>
  <img src="images/luxun.jpg">
  <script src="popup.js"></script>
</body>

</html>